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Contractual interest rate for funds borrowed, under the debt agreement.

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Long-Term Debt - Narrative (Details) £ in Millions, $ in Millions, $ in Millions, $ in Millions		6 Months Ended
	Apr. 20, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 GBP (£)	Jun. 30, 2023 CAD ($)	Jun. 30, 2023 AUD ($)	May 25, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Outstanding debt		$ 1,743.7					$ 1,622.1
U.S. credit agreement — revolving credit line
Debt Instrument [Line Items]
Maximum credit available	$ 1,200.0
Maximum amount available for letters of credit	75.0
Future borrowings available for foreign acquisitions	$ 400.0
Outstanding debt		0.0					0.0
U.S. credit agreement — revolving credit line \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)	1.50%
U.S. Credit Agreement - uncollateralized borrowings in excess of defined borrowings \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)	3.00%
U.K. credit agreement — revolving credit line
Debt Instrument [Line Items]
Maximum credit available \| £			£ 200.0
Outstanding debt		$ 0.0	0.0				24.2
Additional facility capacity under accordion feature \| £			£ 100.0
U.K. credit agreement — revolving credit line \| Sterling Overnight Index Average (SONIA) \| Minimum
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)		1.10%
U.K. credit agreement — revolving credit line \| Sterling Overnight Index Average (SONIA) \| Maximum
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)		2.10%
Senior Subordinated Notes
Debt Instrument [Line Items]
Domestic Subsidiaries ownership guaranteeing obligations (as a percent)		100.00%	100.00%	100.00%	100.00%
Change of control, redemption price as a percentage of principal		101.00%
Sale of assets, redemption price as percentage of principal		100.00%
3.50% senior subordinated notes due 2025
Debt Instrument [Line Items]
Outstanding debt		$ 546.9					546.2
Interest rate		3.50%	3.50%	3.50%	3.50%
3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Outstanding debt		$ 495.4					495.1
Interest rate		3.75%	3.75%	3.75%	3.75%
3.75% senior subordinated notes due 2029 \| Debt Redemption, Prior To June 12, 2024
Debt Instrument [Line Items]
Debt instrument, redemption price percentage		100.00%
3.75% senior subordinated notes due 2029 \| Debt Instrument Redemption Period Prior To May 2021
Debt Instrument [Line Items]
Specified equity offerings, percentage of debt which may be redeemed		103.75%
3.75% senior subordinated notes due 2029 \| Minimum \| Debt Instrument Redemption Period Prior To September 2022
Debt Instrument [Line Items]
Debt instrument, redemption price percentage		40.00%
Canada credit agreement
Debt Instrument [Line Items]
Maximum credit available						$ 150.0
Outstanding debt		$ 53.2		$ 70.5			0.0
Canada credit agreement \| Canadian Prime Rate
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)		(0.50%)
Canada credit agreement \| Canadian Prime Rate \| Maximum
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)		2.00%
Australia capital loan agreement \| Australian BBSW 30-Day Bill Rate
Debt Instrument [Line Items]
Base rate of interest on loans		30-day Bill Rate
Australia working capital loan agreement
Debt Instrument [Line Items]
Outstanding debt					$ 36.2
Australia working capital loan agreement \| Australian BBSW 30-Day Bill Rate
Debt Instrument [Line Items]
Base rate of interest on loans		30-day Bill Rate
Australia credit agreement
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)		2.29%
Outstanding debt		$ 24.1			$ 75.0		21.6
Revolving Mortgage Facility
Debt Instrument [Line Items]
Maximum credit available		300.0
Outstanding debt		176.8
Current borrowing capacity		$ 251.2
Revolving Mortgage Facility \| Prime Rate
Debt Instrument [Line Items]
Line of credit basis spread on variable rate, increase (decrease) (as a percent)		(1.68%)
Mortgage facilities
Debt Instrument [Line Items]
Outstanding debt		$ 585.6					$ 494.3